I bought a refurbished Mini 2 for the fun of it. I can connect to the drone, flip the slider to take off and nothing happens. I have a Sandisk Ultra Plus 64Gb card that won't format. I don't think that is the problem but I'm going back to WalMart to get another, less perfect card. I need firmware updates on the drone and the RC but doing that seems to be a mystery, Still, my app says "Ready to Fly." What is the problem?